Verifying files' integrity with Penteract File Checksum-Hash Verifier™ is as simple as can be. Just drag the file in, and the app will calculate the file's hash. You can also paste the expected hash in the appropriate box and the verifier will inform you whether or not the file's hash is as expected.

The app is minimalistic - there are no items in files' context-menus and no extra tab on files' properties to get in your way. Just launch the app from the start menu when you need it.